You cant it already has one.
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You have to give him a cookie and then G's propeller hat.
in the gadget room and click on the sun hat
In the corner of the Gadget Room, there is a shelving unit and the large propeller hat is on the left side of the central shelf.
The Puffle Hat was from the 2010 Puffle Party, and isn't on clubpenguin anymore.
The propeller hat is in Gadget Room near the TVs.